MilHojas
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I wrote usually because without a vaccine, the threshold is reached after enough people just die, leaving the virus with fewer bodies to spread to ...
It depends how on deadly is the decease. If it has 1% death rate, then 1% will die eventially even if everybody gets infected, but the threshold will still be reached when about 80% of population gets infected.
It just can not spread effectively when significant number of people is immune (not because they are dead).